$ git clone -n https://src.fedoraproject.org/rpms/libobjc2.git /var/lib/mock/f41-build-side-1-2967369-35807/root/chroot_tmpdir/scmroot/libobjc2
Cloning into '/var/lib/mock/f41-build-side-1-2967369-35807/root/chroot_tmpdir/scmroot/libobjc2'...
$ git fetch origin b08d167aafd71576242dd99dad37aa835756c96d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libobjc2
 * [new ref]         b08d167aafd71576242dd99dad37aa835756c96d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b08d167 convert GPLv2 license to SPDX